| http://www.w3.org/ns/prov#value | - l, tetracyclo[4,4,0,12,5,17,10]-dodecanediyl, and tetracyclo[4,4,0,12,5, 17,10]dodecanetriyl. [0046] Letters x, y and z are integers of 1 to 5 corresponding to the valence of Z and Z???, preferably 1 to 3, and more preferably 1 or 2. [0047] R1 is a group represented
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